Brake apparatus for railway vehicles



w. HILDEBRANDY. BRAKE APPARATUS FOR RAILWAY VEHICLES.

APPLICATION FILED IULYZI, 1920. 1

Patented Aug. 1, 1922.

' pressure-equalizing AKTIENGESELL$GHAFT, OF LICHTENBEBG, BERLIN, GERMAN 'K" Beanie Arrnnarrns non naiLwaY vnnroiins.

Application filed July' 21,

1 '0 all "Ltit 0m it 122 my concern:

Be it known that I, Hibernia; Elli-DE- BRAND, a citizen of the German Republic, residing at Neue Baluiliot'strasse 9*17, Lichtenberg, Berlin, '0. 112, Germany, have invented certain new and useful. Improv ments in Brake Apparatus for Railway Vehicles (for which the following patents have been granted to me: in Germany, 306,686, dated December 28, 1916; Hungary, 72,310, dated February 20, 1917; Switzerland, 75,611, dated February 19, 1917; Spain, (53,995, dated March 1, 1917; Denmark, 528,999, dated February 18, 19118; Turkey, 2,813, dated March 26, 1918; Norway, 13,701, dated January 23, 1918; and for which I have filed applications in Austria, 772/17, dated Feb. 17, 1917; Sweden, 598/17, dated February 28, 1917; Italy, sac sit, dated March 15, 1917; Great Britain,3,666, dated March 13, 1917 Holland, 9,4t5et, dated February 19, 1918; Finland, dated June 21, 1919), of which the following is a specification.

This invention relates to adouble chambered brake in which a pressure equalizing communication exists between the working chamber and the idle chamber of the brake cylinder in the released position of the brake-cylinder piston.

Known contrivances of this type have the disadvantage that when the brake actions are initiated or air is allowed to escape from the idle chamber of the double chambered brake cylinder, the communication between working chamber are thereby adversely al fected, as a loss of air occurs therein owing to the escape of compressed air. By diminishing the open cross sectional area of the communication these disadvantages can of course be reduced, but not absolutely removed; moreover by the narrowing of the pressure equalizing communication the quick filling; up of the work ing chamber, desired for instance in vehicles that may subsequently be attached to the train, is adversely afl'ected.

Specification of Letters Patent. E altQ1}tig(fl Aug, 1, 31922,

1920, Serial Ilo. 398,038,

valve which governs the outlet or, compressed air from the idlespace, v Thisadiust- 1119.111? is effected in such manner that the controlling slide-valve shuts oil the pressureequalizing communication in the control valve before it opens the outlet "from the idle chamberto theatmosphere. y

The drawing shows a .dia raminatical representation of the subject-matter oi. the invention." l i i I The double chambered brake-cylinder a is divided by the brake piston Zi, into two spaces B, A, that is, the idle space and the working chamber.) The piston rod 0 of the brakepiston is attachedto the brake gear through the closure piston 17. The idle chamber B communicates, in the released position ofthe brake piston as illustrated, through passages, pipes or the like, 6, 7, one at each end, with the slide-valve grating or grid met the control valve g, while a pipe it for the, compressed fluid leads from; the working chamber to" the controlling slide valve chamberv C of the contiol valve The controlling piston chamber 6 communicates by a branch pipe is with the main brake pipe Z, and can communicate by a pipe q with a passage .9 in the valve m, which passage a in the position shown makes communication with the pipe 6 as shown in dotted lines in the drawing. In the normal or released position of the control piston a illustrated, the control slide valve m closes the opening of the pipe 0 to the atmosphere through p in the slide-valve grating, while the passage 7' is in this position open to the controlling slide-valve chamber C, so that the Working chamber A can be filled with compressed air from the brake pipe, through the controlling slide valve m, along the path 7c, 2', g, m, e, B, j C, it. When the control piston moves from the normal. position into the right-hand end position, not specifically illustrated, the controlling slide valve 722,

which is carried along-by the controlling piston at, first covers the opening of the passsage f in the slide-valve grating, so that the pressure equalizing communication B, C, it A from the idle chamber to the working chamber is interrupted, the passage 6 in the slide-valve grating being" then uncovered "and at the same time connected through the space of the D-slide valve with the opennot specifically illustrated. .10

idle chambers is interrupted, thebrake pising pleading to the atmosphere. Consequently compressed air escapes from theidle v chamber B along the paths, 0, p to the at mosphere, and the brake piston]; is displaced from the released position towards theleftjinto' the-braking position, which is As the pressure outlet from the idle chamber-B is not opened until after the pressure equalizing communication between the working andv ton b is prevented from remaining still when'the brake actions are initiated, the

, said brakdpiston being displacedv with certainty, and consequently, the brake gear is tightened, and the escape of compressed air from the working chamber, or a loss of 1 pressure Y therein, thereby effectually pre;

vented. i

Theinvention is of course not limited to the special construction of the double. chambered brake described above and illustrated,

especially as the drawing merely gives a diagrammatical arrangement oiithe subject ofthe passages e, f, h aredetermined ac-' cording tothe purpose and application, the

i i "matter of the invention. Therefore the most manifold modifications and constructional forms may also be employed, without departing from the ature of the invention. For instance the internal cross-sectional area control valve 9 may further be directly 'appliedto the brake cylinder. The invention i may also be applied'to a combination brake I consistingof a double chambered brake and a single. chambered 'brake in combination with a corresponding control valve.

WhatI claim anddesire to secure by Letters Patent of the United States is:-

1 .Indouble chambered brake apparatus for railway vehicles, a brake cylinder of uniform working diameter, a piston movable therein dividing said cylinder into a working chamber and an idle chamber, a valve chamber, a valve movable in the said valve chamber, pressure equalizing communications on both sides of the piston opening into .i

into the said valve chamber, and an outlet to atmosphere from thebrake cylinder in front of the said piston, so positioned that in the movement of" the said valve one of the said equalizing communications is closed. before the said outlet is opened.

3. In double chambered brake apparatus for railway vehicles, a twin chambered brake with only one brake cylinder, a piston movable in the said cylinder and dividing same into a. working chamber and an idle chamber, a valve, chamber, a free constant communication 't'ronrsaid working chamber to said valve chamber, communications from tions on. either side of the pistonopening each endof said idle chamber to said valve chamber, andfan outlet to atmosphere from said valve chamber and a valve movable in said valvechamber,the said valve controlling the said outlet and the sa d communications from sald idle chamber.

WILHELM HI DE RANDQ 

